Perforating-rule.



No. 646,l84. Patented Mar. 27; I900. J. A. LOFSTEDT. PEBFOBATING RULE.

(Application filed Aug. 4, 1899.)

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Adar/46y UNITED STATES ATENT OFFICE.

JULIUS AUG. LOFSTE DT, OF YONKERS, NEW YORK.

PERFORATlNG-RULE.

SPECIFICATION forming part of Letters Patent No. 646,184, dated March 27, 1900.

Application filed August 4, 1899.

To all whom it may concern.-

Be it known that I, JULIUs AUG. LOFSTEDT, a citizen of the United States of America, and a resident of Yonkers, county of Westchester, and State of New York, have invented certain new and useful Improvements in Perforating- Rulers, of which the following is a specification.

My invention relates to perforating-rulers for use in type-forms for automatically perforating the paper when the impressions are made to facilitate separating the printed pages; and it consists of improvements in the construction of devices whereby the perforating-blade is made to drop below the surface of the type-form to prevent it from marking the paper and for avoiding injury to the inking-rolls and to rise and be efiectively sup ported to perforate the paper when the platen descends to make the impressions, as hereinafter described, reference being made to the accompanying drawings, in which- Figure 1 represents a side elevation of my improved perforating-ruler with the perforating-blade in the lower position, as when'the inking-rolls are to be operated. Fig. 2 is a side elevation of the said ruler with the perforating-blade in its upper position for receiving the pressure of the platen and perforating the paper. Fig. 3 is a side elevation with the front side plate removed to show the construction and arrangement of the means for operating the perforating-blade. Fig. 4 is a transverse section of the ruler on line a a, Fig. 2. Fig. 5 is a transverse section on line 00 00, Fig. 3.

The perforating-blade?) is located between two side plates 0, bolted to the spacing-strip d, and spacing-pieces a being fitted in the grooved upper edge of a stiffening-plate n, which has several inclinations e in its lower edge, under which is a sliding barf, having corresponding inclines g on its upper edge foracting on the inclines e of the blade-holding plate when shifted along under them and thrusting said blade up. Said sliding barf also has facets 0 at the upper extremities of its inclines g, and plate 12 has corresponding facets p at the lower extremities of its inclines e, forming bearings whereby plate a is firmly supported at intervals along its length under the pressure of the platen.

Serial No. 726,142. (No model.)

' The plate 12 has end bearings at q against spacing-pieces a to prevent it from moving lengthwise, and at each end is a spring on to force it down when released by the liftingbarf.

As thus far described the construction is practically the same as in some other perforators and is not herein claimed as new.

To obtain sufficient lengthwise movement of the liftin g-bar f for raising the perforatingblade with the necessarily-limited movement of the push-stud 'i on which the platen acts to operate said lifting-bar, said bar is formed with the incline s at the extremity next to the push-stud, between which and the end of the space in which the lifting-bar slides is a powertransmitting bar a, normally resting at one end in the angle between the spacing-bar d and the spacing-piece a and at the other end on inclines at its upper extremity, over which bar and intermediately of its ends the pushstud is located, so as to be thrust onto the bar and force its end resting on incline 3 down said incline,and thus force the bar along under plate n to raise it.

a The bearing of the push-stud on bar h is about half the height of the incline 8, while the end of bar it is made to move the full height of the incline, making considerablygreater lengthwise movement of the liftingbar than if the push-stud acted directly on the incline 8, thus obtaining the requisite lengthwise movement of the 1ifting-bar witha push-stud of very limited movement.

The movement of the push-stud is limited, because of the limited depth of the type-form afiording but little space for it and because it is also desirable to employ a yielding pushstud to lessen the shocks and that will, after having efiected the rise of the perforatingblade, yield while the platen completes its movement, for which there must be a little allowance, this being a contrivance to avoid driver when the perforating-blade is to be removed. Stud-screws 'v are set in one side plate to bear against the inside of the other plate to prevent springing of the side plates and pinching plate at when the ruler is keyed r5 up in the type-form. for these screws.

Instead of bolting the side plates 0 to the spacing-strip d said side plates and spacingstrip may be produced by placing a groove in a solid piece.

In practice a piece of sheet-brass will be pasted on the tympan-sheet of the platen to act on the push-stud; but this forms no part of the invention claimed.

The perforating-blade is removably fitted in the plate at for removing, for sharpening, and renewal, as may be required.

The manner of using such perforatingrulers in type-forms is common and well known and need not be shown in the draw- Plate at is notched at w' ings, theinvention being confined to the construction of the ruler.

\Vhat I claim as my invention is- 1. In a perforating-ruler, the combination with the perforating-blade, b at, having the series of inclines e and facets p in its lower edge, and the lifting-bar f having the series of inclines g and facets 0 in its upper edge, and the inclined extremity s, of the powertransmitting bar intermediate of the inclined 4o extremity s, and the end spacing-piece, the push-stud and the 1'etracting-spring,said stud adapted to act on said bar intermediate of its ends.

2. In a perforating-ruler, the combination with the perforating blade, reciprocating blade-liftin g bar, power-transmitting bar and retracting-spring, of the push-stud having the yielding plungerand compression-spring.

The combination with the side plates 0, plate n and spacing-strip (Z, of the stud-screws 2) adapted to stay the side plates against compression, said plate n being notched for said stud-screws.

Signed by me at New York, N. Y., this 17th day of July, 1899.

JULIUS AUG. LOFSTEDT. lVitnesses:

A. P. Tnavnn, O. SEDGwIeK. 

